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BUG: DataFrame.to_json() does not accurately serialize floats such that they can be deserialized without lost information

Bug

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Status: Open.

#62072 In pandas-dev/pandas;

· PentageerJoshuaMeetsma opened on Aug 8, 2025

BUG:Pandas: Custom Metadata in DataFrame Subclass Not Deep-Copied

Bug

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Status: Open.

#62071 In pandas-dev/pandas;

· Qi-henry opened on Aug 8, 2025

BUG: is_scalar(Enum) gives False

Bug

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Status: Open.

#62063 In pandas-dev/pandas;

· cmp0xff opened on Aug 7, 2025

BUG: Inconsistent behavior of <code>MultiIndex.union</code> depending on duplicates and names

Bug

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

setopsunion, intersection, difference, symmetric_differenceunion, intersection, difference, symmetric_difference

Status: Open.

#62059 In pandas-dev/pandas;

· torfsen opened on Aug 6, 2025

BUG: ArrowEA.astype to categorical returning all-NaT

Arrowpyarrow functionalitypyarrow functionality

Bug

CategoricalCategorical Data TypeCategorical Data Type

datetime.datestdlib datetime.date supportstdlib datetime.date support

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Status: Open.

#62051 In pandas-dev/pandas;

· jbrockmendel opened on Aug 5, 2025

ENH: String functions for df.aggregate()

Enhancement

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

Reduction Operationssum, mean, min, max, etc.sum, mean, min, max, etc.

Status: Open.

#62050 In pandas-dev/pandas;

· JustusKnnck opened on Aug 5, 2025

BUG: rank with object dtype and small values

Bug

Missing-datanp.nan, pd.NaT, pd.NA, dropna, isnull, interpolatenp.nan, pd.NaT, pd.NA, dropna, isnull, interpolate

NA - MaskedArraysRelated to pd.NA and nullable extension arraysRelated to pd.NA and nullable extension arrays

Transformationse.g. cumsum, diff, ranke.g. cumsum, diff, rank

Status: Open.

#62036 In pandas-dev/pandas;

· jbrockmendel opened on Aug 3, 2025

BUG: Wrong inferred type in case of a mixture of boolean, float and integers

Bug

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Status: Open.

#62033 In pandas-dev/pandas;

· tqa236 opened on Aug 3, 2025

BUG: NaN vs NA in mixed reduction

Bug

PDEP missing valuesIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprintIssues that would be addressed by the Ice Cream Agreement from the Aug 2023 sprint

Reduction Operationssum, mean, min, max, etc.sum, mean, min, max, etc.

Status: Open.

#62024 In pandas-dev/pandas;

· jbrockmendel opened on Aug 2, 2025

DEPR: convert_dtypes keywords

DeprecateFunctionality to remove in pandasFunctionality to remove in pandas

Dtype ConversionsUnexpected or buggy dtype conversionsUnexpected or buggy dtype conversions

Needs DiscussionRequires discussion from core team before further actionRequires discussion from core team before further action

Status: Open.

#62022 In pandas-dev/pandas;

· jbrockmendel opened on Aug 2, 2025

BUG: pd.api.types.is_signed_integer_dtype(np.floating) throws TypeError

Bug

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Status: Open.

#62018 In pandas-dev/pandas;

· windiana42 opened on Aug 1, 2025

BUG: Sql select from database type cast issue

Bug

Needs TriageIssue that has not been reviewed by a pandas team memberIssue that has not been reviewed by a pandas team member

Status: Open.

#62013 In pandas-dev/pandas;

· Closius opened on Jul 31, 2025